Meaning

adjective characterized by intense emotion

adjective characterized by strong enthusiasm

adjective glowing or shining like fire; - Alexander Pope

originFirst attested circa 14th century as Middle English ardaunt, borrowed from Anglo-Norman ardent and Old French ardant, from Latin ardentem, accusative of ardēns, present participle of ardeō (“to burn”).

Etymology from Wiktionary, CC BY-SA 3.0